Let me just jump in here and point out the giant flaw in this conspiracy theory.
The key predictor of population growth in a given group is affluence. There is a century's worth of research to back this up. If you want the population growth rate to drop, then you increase literacy, improve public health and sanitation (this means everything from clean water supplies and sewage treatment to vaccination programs), and improve nutrition, housing, and economic security. The population growth will drop below zero within two generations (about 45 years).
No, the power elite have no interest in seeing the population decline. A steady source of desperate people wanting jobs is where they see the future.